<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <form>
      <input type="file" name="avatar" accept="image/*" placeholder="请选择头像" />
      <button>上传文件</button>
    </form>
    <img src="" alt="" class="avatar" style="width: 500px" />
  </body>
  <script src="./axios.js"></script>
  <script>
     const form = document.querySelector('form')
     const img = document.querySelector('.avatar')
     form.addEventListener('submit',function(e){
         e.preventDefault()
         const formData = new FormData(form)
         
         axios.post('http://ajax-api.itheima.net/api/file',formData).then(({data:res})=>{
          const url =res.data.url
           img.src = url
         })
            
     })
   
  </script>
</html>
